Coating apparatus



Dec; 3 1, 1929 v s'ro s 1,741,382

COATING APPARATUS Filed Jan. 28, 1925 IN VEN TOR.

By 24L 11W dw Mifi 25 ATTORNEY.

Patented Dec. 31, 1929 UNITED STATES JOHN STOGDELL STOKES, O1 HUNTHGDONVALLEY, PHNBYIYANIA, ASSIGNOR TO STOKES AND SMITH CODANY OIPHILADELPHIA,

'IION OF PENNSYLVANIA rmstnvmm, 4 coupons- CO A'IING APPARATUSApplication fled January as, s. Serial no. 5,187.

My invention relates to apparatus for afiplying to sheets, of paper orother materia a coating of any suitable material, as adhesive wax, etc.

In accordance with my invention, the coating material is disposed orcarried upon a surface, as that of a roll. The sheet is brought intocontact with the surface for receiving therefrom the coating material,and to improve the efl'ectivenessof the coatin operation there isexerted upon the sheet pre erably directly, fluid pressure.

Further in accordance with my invention, there is disposed adjacent thecoating-carrying surface and beyond the region. of application of thefluid pressure a guide surface to maintain prolonged contact of thesheet with the coating surface.

Further in accordance with my invention, the extent of outlet area ofthe fluid passage or passages is variable or adjustable to suitparticular circumstances, and the outlet or outlets of the fluid passageor passages may be localized with respect to suitable portions of asheet. a

Further in accordance with my invention, sheets whosecoating-receivingsurfaces arenot plane or flat, as in the caseofembossed sheets or sheets having local reinforcements on the surfacethereof, as by tabs, may have applied thereto a coatin material bystructure of the character re erred to, the fluid pressure serving tocause the coating material to be applied to the raised portions of thesurfaces and to closely adjacent areas, or to the reinforcing elementsor tabs and to those portions of the sheet lying close to them.

My invention resides in a method and apparatus of the characterhereinafter "described and claimed. For an understanding of my methodand for an illustration of one of the various forms my structure maytake, reference is to be had to the accompanying drawing, in which: Fig.1 is a side elevational view, partly in vertical section, of apparatusembodying my invention.

Fig. 2 is a front elevational view of the fluid-pressure-applying meansand an associated roller.

Fig. 3 is a cross sectional view on the line 33 of Fig. 2.

Fig. 4 is a plan view of a sheet provided with reinforcin elements ortabs.

Fig. 5 is a si e elevational view, partly in section, illustrating thesheet and its reinforcement in coating receiving position.

Referring to the drawing, 1 is a receptacle or pan in which is disposedthe fluid coating material, as glue, melted parafline, etc. The rotatingroll 2 is partly immersed in the material in the pan 1, and delivers tothe coating roll 3 coating material from the receptacle 1. In groovesdisposed longitudinally of theroll 3 are disposed stationar strippermembers 4, carried upon a suitaid e support, as bar 5.

The sheet S is fed by the feed rollers 6 and 7 to the feed rollers 8 and9, which pass the sheet onwardlyover the guideplate 10 between the idlerguide roller 11 and the coating roll 3. The sheet continues its movementupwardly through the narrow space between the guide roller 3 and thearcuate guide plate 12, whereupon it is deflected by the front edges 4'of the stripper members 4 on to the conveyer belt 13, which travels overthe idler roller 14 and is driven b the rolls 15 and 16.

The idler roller 11. as bearings in the transversely extending air blastbar 17, integral with or secured to which is the aforesaid plate 12.

Extending longitudinally of the bar 17 is the passage 18, with whichcommunicates the pipe 19, through which is delivered any suitable fluidunder pressure, for exam le, air. The passage 18 is closed at its top byt e plate 20. Communicating with the passage 18 is any. suitable numberof fluid-outlet passages 21, of any suitable size or shape, throughwhich the fluid under ressure is discharged against the rear face 0 thesheet S, holding it snugly against the coating surface or roll 3, fromwhich it receives upon its front face the adhesive or other coatingmaterial from the coating surface of the roll 3.

Fluid pressure so applied effects intimate contact between the sheet andthe roll 3, with resultant improvement in distribution of the coatingmaterial upon the sheet and its intily of the total outlet area of thefluid-delivery passage or passages, there are provided insert bars orblocks 22, Fig. 3, extending into the passage 18 .to an extentsuflicient to cover the outlet passage or passages 21. in effectblockingthem ofl". The members 22 are provided with screw-threaded studs 23receiving the nuts 24, whereby the members 22 are held in position tothe cover plate 20.

The method and apparatus above described are suitable for applyingcoating material not only to plain or simple sheets, but also to thoseprovided locally with reinforcing elements or tabs 25, Fig. 4. In theexample illustrated the sheet S may be a wrapper or cover to beadhesively applied to a box by a box-wrapping machine, and thereinforcing tabs 25 are applied at those portions of the sheet wherethey arelapped around the corners of the box.

For coating reinforced sheets, the same apparatus and method areutilizable, and the flllld pressure as applied by the fluid dischargefrom the passage or passages 21 may be 10- cally applied adjacent thereinforcing elements or tabs 25, thereby causing intimate contactbetween the tabs or'reinforcing elements and the coating roll 3 andfurther causing close approach to the roll 3 of those portions of thesheet S immediately adjacent the elements or tabs 25, whereby there isnot left uncoated substantial areas of the sheet S immediatelysurrounding the reinforcing elements or tabs.

In Fig. 5 a sheet S, reinforced by elements 25, is shown in position inwhich the reinforcing element is forced into intimate contact with theroll 3 by the fluid pressure as well as the immediately adjacentportions of'the sheet S, whereby both the reinforcing element and theadjacent portions of the sheet are effectively coated.

' of, if supplied therewith, effecting a brushing or wiping actionresulting in more intimate application of the glue or other coatingmaterial to the sheet. Accordingly, in addition to the aforesaid wipingaction there is applied the aforesaid fluid pressure procuring in com- Fbination with the wiping action a substantial- 17 perfect application ofglue or coating to the sheet.

For brevity in the appended claims, the tfl-elll air includes air andany equivalent What I claim is: 1. In the art of applying coatingmaterial to sheets, the method which comprises feeding a sheet intoadhering relation with a surface bearing coating material, and.thereafter moving the surface to bring the adhering sheet into a regionwhere air 'under ressure is applied to the back of the sheet to orce itinto intimate contact with said surface.

2. In the art of applying coatingmaterial to sheets having raisedportions on their coating-receiving faces, the method of insuringcoating of said sheets in regions adjacent said raised portions whichcomprises efiecting contact between a raised portion of a sheet and asurface bearing coating material, and applying air under pressuredirectly to the back of the sheet to an area thereof contiguous .tosaidraised portion.

3. In the art of applying coating material to sheets having raisedportions on their coating-receiving faces, the method of insuringcoating of said sheets in regions adjacent said,

raised portions which comprises effecting contact between a raisedportion of a sheet and-a surface bearing coating material, and applyingair under pressure directly to the back of the sheet at said raisedportion and to an area of the sheet contiguous tosaid raised portion.

4. In the art of applying coating material to sheets having raisedportions on their coating-receiving faces, the method of insuringcoating of said sheets in regions adjacent said raised portions whichcomprises effecting contact between a raised portion of a sheet and asurface bearing coating material, and exerting pressure upon the back ofthe sheet by an air jet impinging directly thereon at an area thereofcontiguous to said raised portion.

5. In the art of applying coating material to sheets having raisedportions on their coating-receiving faces, the method of insuringcoating of said sheets in regions adjacent said raised portions whichcomprises effecting contact between a raised portion of a sheet and asurface bearing coating material, and exert ing pressure upon the backof the sheet byan air jet impinging directly thereon at said, raisedportion and upon an area of the sheet contiguous to said raised portion.

6. In the art of applying coating material to sheets, the method whichcomprises effecting wiping contact between a sheet and a surface bearingcoating material, and applying air' under pressure directly to the backof the sheet in the region of the wiping contact.

7. In the art of applying coating material to sheets, the method whichcompriseseifectair under pressure directly to the back of the ing wipingcontact between a sheet and a surface bearing coating material, andexerting pressure on the back of the sheet by an air jet impingingthereon in the region of the wiping contact.

8. In the art of applying coating material to slieets having raisedportions oftheir coating-receiving faces, the method which comprisesetfecting wiping contact between a raised portion of a sheet and asurface bearing coating material, and applying air under pressuredirectly to the back of the sheet in the region of the wiping contact toan area of the sheet contiguous to said raised portion.

9. In the art of applying coating material to sheets having raisedportions on their coating-receiving faces, the method of insuringcoating of said sheets in regions adjacent said raised portions whichcomprises effecting wiping contact between a raised portion of a sheetand a surface bearing coating material, and exerting pressure on theback of the sheet in the region of the wiping contact to an area of thesheet continguous to said raised portion by an air jet impingingdirectly upon said area. f

10. In the art of applg ving coating material to sheets having raiseportions on their coating-receiving faces, the method of insuring duringthe exertion of said pressure upon the sheet.

14. Apparatus for applying coatings to sheets having raised portionscomprising a surface bearing coating material, means for bringing araised portion of a sheet into contact with said surface, means applyingair under pressure directly to the backof the sheet at said raisedportion and an area of the sheet adjacent said raised portion, and

means for effecting wiping action between said sheet and said surfaceduring the exertion of said pressure upon the sheet.

15. Apparatus for applying coatings to sheets'having raised portionsadjacent their corners comprising a rotatable coating roll, means forbringing a corner and a raised portion of a sheet into contact with saidroll, means for directing a jet of air directly against the back of thesheet, and means for moving said sheet with respect to said jet.

16. Apparatus for applying coatings to sheets having raised portionsadjacent their corners comprising a rotatable coating roll, means forbringing a corner and a raised portion of a sheet into contact withsaid. roll, means for directing a jet of air directly against the backof the sheet, and means for moving said sheet and said surface withrecoating of said shee in regions adjacent sai LfiP to said l wipingcontact b ween a raised portion of a sheet, and a surf be hearingcoating material, and exerting pr' ssure on the back of the sheet in theregion of the wiping contact to areas of the sheet at and contiguousto'said raised portion by an Zair jet impinging directly upon raisedportions sfli ich comprises effecting said areas.

11. App 'ratus for applying coatings to sheets having raised portionsadjacent their corners, comprising a rotatable coating roll, meansfor(bringing a corner and a raised portion of a sheet into contact withsaid roll, and means for applying air under pressure directly to theback of the sheet at an area thereof contiguous to said raised portion.

12. Apparatus for applying coatings to sheets having raised portionsadjacent their corners comprising a rotatable coating roll, means forbringing a corner and a raised portion of a sheet into contact with saidroll, and means applying air under pressure directly to the back of thesheet at said raised portion, and an area of the sheet adjacent saidraised portion.

13. Apparatus for applying coatings to sheets having raised portionscomprising a' surface bearing coating material, means for bringing araised portion of a sheet into contact with SitldSllIfflCG, means forapplying sheet at an area thereof contiguous to said raised portion,and. means for eflecting wipmg action between said sheet and saidsurface 17. Apparatus for applying coatings to sheets, comprising aroller bearing coating material, a second roller disposed closelyadtween said rollers, an air passage having its outlet directed againstsaid first named roller adjacent said second named roller, and means fordelivering air under pressure to said passage.

18. Apparatus for applying coatings to sheets, comprising a rollerbearing coating material, a guide member having a surface adjacent saidroller, means for passing a sheet between said roller and guide member,a passage whose outlet is directed toward said roller and disposedadjacent said guide member, and means for delivering air under pressureto said passage.

19. Apparatus for applying coatings to sheets, comprising a rollerbearing coating material a second roller disposed adjacent thereto, aguide member disposed adjacent said first named roller, means fordelivering a sheet between said rollers and bet-ween said first namedroller and said guide member, a passage having an outlet directed towardsaid first named roller and disposed between said second named rollerand said guide member, and means for delivering air under pressure tosaid passage.

20. Apparatus for applying coatings to sheets, comprising a rollerbearing coating material, means for bringing a sheet into contact withsaid roller, and means for applying pressure to the back of said sheetat the region acent thereto, means for feeding a sheet be of contactwith said roller comprising a member having a passage, means fordelivering air under pressure into said passage, and a plurality ofpassages communicating with said first named passage and having theiroutlets directed towards said roller.

21. Apparatus for applying coatings to sheets, comprising a rollerbearing coating material, means for bringing a sheet into contact withsaid roller, and means for applying pressure to the back of said sheetat the region of contact with said roller comprising a member having apassage, means for delivering air under prcssureinto said passage. aplurality of passages communicatlng w th said first named passage andhaving their outlets d1- reeted towards said roller, and means forblocking off a desired number of said passages.

22. Apparatus for applying coatings to sheets, comprising a rollerbearing coating material, a co-acting roller between which and saidfirst named roller a sheet is passed in contact with said first namedroller, a member extending longitudinally of said. second named rollerand having therein a longitudinally extending passage, means fordelivering air under pressure to said passage, and a plurality ofpassages communicating with said passage and having their outletsdisposed along said second named roller adjacent thereto anddirectedtowards said first named roller. I

23. In the art of applying adhesive to tabbed wrappers, the method ofinsuring coating of said wrappers adjacent said tabs which compriseseffecting contact between a wrapper and an adhesive coated surface, andapplying air under pressure to the back of said sheetat and contiguousto the tabs.

24. Apparatus for applying coatings to sheets, comprising a rollerbearing coating material, means to guide sheets into contact with saidrollers, means to strip sheets from said roller, means to apply pressureto the back of each of said sheets disposed between said first andsecond means and comprising a member having a passage directed towardsaid roller, and meansto deliver air under pressure to said passage. 7

'25. Apparatus for applying coating to sheets comprising a rotatingroller bearing coating material, a guide member having a surfaceadjacent said roller, means for passing a sheet between said roller andguide member ata speed less than the surface speed of said roller, apassage having an outlet adjacent and directed toward said roller, andmeans for delivering air under pressure to said passage.

26; In the artof applying coating material to sheets, the method whichcomprises efiecting contact between a sheet and a moving surface bearingthereon coating material, effect- 65 ing relative movement between saidsurface and the sheet in contact therewith, and during said relativemovement, applying air under pressure to the sheet to force it into more

